Combination recorder and reproducer of sound



Jul 26 1927.

J c. scRABic COMBINATION RECORDER AND REPRODUCER OF SOUND Filed July 5. 1924 hatented duty 26, M27;

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application filed July 3, 1924. Berta} Kc. 728,904.

- My invention relates to a combination recorder and reproduce! of FOUIlCl from physical or electrical sources.

The primary object of iny invention isto provide a device of this character which is capable of simultaneously reproducing sound from radio circuits and recording'the same for future reproduction.

A further object of my invention is to pro vide a sound reproducer having means for causing its stylus bar and diaphragm to vibrate in response to either variations in current value of a radio circuit or to the undulations of ,a groove on a talking-machine is record whereby sound may be reproduced from either electrical or hysical source.

With these and other 0 jects in view which will become apparent as the description proceeds my invention consists in the novel features of construction, combinations of elements and arrangements of parts hereinafter to be fully described and claimed.

In the accompanying drawing forming a part of the specification:

Figure l is a side elevation of the sound repr duces Figure 2 is a vertical section thereof, Figure 3 is a horizontal section taken on the line 3--3,of Figure 1,

Figure 4 is a side elevation of a modified form of reproducer,

Figure 5 is an end elevation partly in sec tion thereof. and I Figure 6 is an enlarged fragmentary view of the lower portion of Figure 5.

Referring to the specific embodiments of my invention shown in the drawing wherein like reference numerals refer to like and similar parts throughout the several views, the numeral 1 indicates the casing within which is mounted in any conventional man ner the diaphragm 2. The cover 3 and the casing are radially extended to provide the peripheral chamber 4 in which is secured the magnet 5.

The stylus bar 6 is fulcrumed on the points of set screws 7 which are locked in adjusted position by lock nuts 8. The upper end 9 of the stylus bar? is secured in the usual manner to the center of the diaphragm and its lower enlarged portion 10 is apertured to receive the needle 11 which is held in position by the set screw 12.

A portion 13 of the magnet 5 passes through slot 14 in cover 3 and extends in. a horizontal position to the center of the casing 1 at which point it is bent downadjacent the portion '10 of the stylus bar.

A coil 15 is wound on the vertical portion 16 of the magnet 5 and its terminals 17 are des gned to be connected to any conventional radio receiving set. The angle bar 18 which 15 constructed of magnetic material is se-- cured to the portion 10 so that its horizontai arm 19 has directly beneath and close to pole 20 of the magnet 5.

It will be observed that by this construction the stylus bar will be caused to vibrate due to the change in the attraction of the magnet 5 for the arm or armature 19.

The change in strength of pole 20 being due to the varying radio currents inthe coil 15 it is obvious that the diaphragm f3 wili vibrate in response to the variations and reproduce the sound. The needle 11 may also e caused to record the variations upon a record. in order that the sound may produced as often as desired on any talking machine in the usual manner.

In Figures 4; and 5 I have illustrated a modified construction in which both poles- 21 and 22 are utilized to provide a perma-' nent fiux across the gap 23 between said poles. I have shown coils 2 lwound on magnet 25 in order 'that its strength may be increased by passing a current through the coils but the device is operative with a pemanent magnet only. A small formed coil 26 is substituted for the arm 19 and has a flattened portion 27 normally disposed midway, between the poles 21 and 22. In

thiscasc the radio current from a receiving set is passed through coil 26 and the varia tions in the current causes the'coil to vibrate in the gap 23. The vibrations are transmittcd by the stylus bar to the needle 11 and the diaphragm as hereinbefore described. it

Having thus fuliy described my invention it is obvious to one skilled in the art that it is susceptible of many minor changes in construction without departing from the spirit and scope of the invention.

iVhat is claimed is:

1. A reproducing unit comprising :1 cas ing including a sound chamber, a diaphragm seated within said chamber, a stylus pivoted to said casing and having one end thereof engaged with said diaphragm, an armature connected with said stylus on the opposite side of the pivotal connection therewith as regards said diaphragm, a stationary magnet carried by said casingterminating in a pole section arranged ad acent to said ar- .mature, and a coil surrounding said pole section and excited by response to received radio current pulsations.

25A reproducing unit comprising a casrag including a sound chamber, a single dia- :,--p"hrag nn mounted in said chamber, a stylus pivoted to said casing and having. its upper end engaged with said diaphragm, the lower end of said stylus, below said pivot being provided with an armature arranged adjacent to one end of said magnet, and a coil surrounding the latter end of said magnet and adapted to create a magnetic field by res onse to the fluctuations of received" ra io current positions, whereby said stylus may be operated selectively to vibrate the single diaphragm in response to radio posisaid diaphragm with a circular socket, a

stationary magnet positioned Within said socket and terminated in an offset core sec tion disposed adjacent to said armature, and a coil surrounding said core section and adapted to be energized by response to re ceive radio current pulsations.

In testimony whereof I aflix my signature.

CARL soRABIo. 

